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//
// Copyright (c) Facebook, Inc. and its affiliates.
// Copyright (c) 2022 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
//
// Part of libcu++, the C++ Standard Library for your entire system,
// under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//
#ifndef _CUDA___CONCEPTS
#define _CUDA___CONCEPTS
#ifndef __cuda_std__
#include <__config>
#endif //__cuda_std__
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
#if _LIBCUDACXX_STD_VER > 11
#define _LIBCUDACXX_PP_CAT_(_Xp, ...) _Xp##__VA_ARGS__
#define _LIBCUDACXX_PP_CAT(_Xp, ...) _LIBCUDACXX_PP_CAT_(_Xp, __VA_ARGS__)
#define _LIBCUDACXX_PP_CAT2_(_Xp, ...) _Xp##__VA_ARGS__
#define _LIBCUDACXX_PP_CAT2(_Xp, ...) _LIBCUDACXX_PP_CAT2_(_Xp, __VA_ARGS__)
#define _LIBCUDACXX_PP_CAT3_(_Xp, ...) _Xp##__VA_ARGS__
#define _LIBCUDACXX_PP_CAT3(_Xp, ...) _LIBCUDACXX_PP_CAT3_(_Xp, __VA_ARGS__)
#define _LIBCUDACXX_PP_CAT4_(_Xp, ...) _Xp##__VA_ARGS__
#define _LIBCUDACXX_PP_CAT4(_Xp, ...) _LIBCUDACXX_PP_CAT4_(_Xp, __VA_ARGS__)
#define _LIBCUDACXX_PP_EVAL_(_Xp, _ARGS) _Xp _ARGS
#define _LIBCUDACXX_PP_EVAL(_Xp, ...) _LIBCUDACXX_PP_EVAL_(_Xp, (__VA_ARGS__))
#define _LIBCUDACXX_PP_EVAL2_(_Xp, _ARGS) _Xp _ARGS
#define _LIBCUDACXX_PP_EVAL2(_Xp, ...) _LIBCUDACXX_PP_EVAL2_(_Xp, (__VA_ARGS__))
#define _LIBCUDACXX_PP_EXPAND(...) __VA_ARGS__
#define _LIBCUDACXX_PP_EAT(...)
#define _LIBCUDACXX_PP_CHECK(...) \
_LIBCUDACXX_PP_EXPAND(_LIBCUDACXX_PP_CHECK_N(__VA_ARGS__, 0, ))
#define _LIBCUDACXX_PP_CHECK_N(_Xp, _Num, ...) _Num
#define _LIBCUDACXX_PP_PROBE(_Xp) _Xp, 1,
#define _LIBCUDACXX_PP_PROBE_N(_Xp, _Num) _Xp, _Num,
#define _LIBCUDACXX_PP_IS_PAREN(_Xp) \
_LIBCUDACXX_PP_CHECK(_LIBCUDACXX_PP_IS_PAREN_PROBE _Xp)
#define _LIBCUDACXX_PP_IS_PAREN_PROBE(...) _LIBCUDACXX_PP_PROBE(~)
// The final _LIBCUDACXX_PP_EXPAND here is to avoid
// https://stackoverflow.com/questions/5134523/msvc-doesnt-expand-va-args-correctly
#define _LIBCUDACXX_PP_COUNT(...) \
_LIBCUDACXX_PP_EXPAND(_LIBCUDACXX_PP_COUNT_( \
__VA_ARGS__, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, \
35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, \
17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, )) \
/**/
#define _LIBCUDACXX_PP_COUNT_( \
_01, _02, _03, _04, _05, _06, _07, _08, _09, _10, _11, _12, _13, _14, _15, \
_16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27, _28, _29, _30, \
_31, _32, _33, _34, _35, _36, _37, _38, _39, _40, _41, _42, _43, _44, _45, \
_46, _47, _48, _49, _50, _Np, ...) \
_Np /**/
#define _LIBCUDACXX_PP_IIF(_BIT) _LIBCUDACXX_PP_CAT_(_LIBCUDACXX_PP_IIF_, _BIT)
#define _LIBCUDACXX_PP_IIF_0(_TRUE, ...) __VA_ARGS__
#define _LIBCUDACXX_PP_IIF_1(_TRUE, ...) _TRUE
#define _LIBCUDACXX_PP_LPAREN (
#define _LIBCUDACXX_PP_NOT(_BIT) _LIBCUDACXX_PP_CAT_(_LIBCUDACXX_PP_NOT_, _BIT)
#define _LIBCUDACXX_PP_NOT_0 1
#define _LIBCUDACXX_PP_NOT_1 0
#define _LIBCUDACXX_PP_EMPTY()
#define _LIBCUDACXX_PP_COMMA() ,
#define _LIBCUDACXX_PP_LBRACE() {
#define _LIBCUDACXX_PP_RBRACE() }
#define _LIBCUDACXX_PP_COMMA_IIF(_Xp) \
_LIBCUDACXX_PP_IIF(_Xp)(_LIBCUDACXX_PP_EMPTY, _LIBCUDACXX_PP_COMMA)() /**/
#define _LIBCUDACXX_PP_FOR_EACH(_Mp, ...) \
_LIBCUDACXX_PP_FOR_EACH_N(_LIBCUDACXX_PP_COUNT(__VA_ARGS__), _Mp, __VA_ARGS__)
#define _LIBCUDACXX_PP_FOR_EACH_N(_Np, _Mp, ...) \
_LIBCUDACXX_PP_CAT2(_LIBCUDACXX_PP_FOR_EACH_, _Np)(_Mp, __VA_ARGS__)
#define _LIBCUDACXX_PP_FOR_EACH_1(_Mp, _1) _Mp(_1)
#define _LIBCUDACXX_PP_FOR_EACH_2(_Mp, _1, _2) _Mp(_1) _Mp(_2)
#define _LIBCUDACXX_PP_FOR_EACH_3(_Mp, _1, _2, _3) _Mp(_1) _Mp(_2) _Mp(_3)
#define _LIBCUDACXX_PP_FOR_EACH_4(_Mp, _1, _2, _3, _4) \
_Mp(_1) _Mp(_2) _Mp(_3) _Mp(_4)
#define _LIBCUDACXX_PP_FOR_EACH_5(_Mp, _1, _2, _3, _4, _5) \
_Mp(_1) _Mp(_2) _Mp(_3) _Mp(_4) _Mp(_5)
#define _LIBCUDACXX_PP_FOR_EACH_6(_Mp, _1, _2, _3, _4, _5, _6) \
_Mp(_1) _Mp(_2) _Mp(_3) _Mp(_4) _Mp(_5) _Mp(_6)
#define _LIBCUDACXX_PP_FOR_EACH_7(_Mp, _1, _2, _3, _4, _5, _6, _7) \
_Mp(_1) _Mp(_2) _Mp(_3) _Mp(_4) _Mp(_5) _Mp(_6) _Mp(_7)
#define _LIBCUDACXX_PP_FOR_EACH_8(_Mp, _1, _2, _3, _4, _5, _6, _7, _8) \
_Mp(_1) _Mp(_2) _Mp(_3) _Mp(_4) _Mp(_5) _Mp(_6) _Mp(_7) _Mp(_8)
#define _LIBCUDACXX_PP_PROBE_EMPTY_PROBE__LIBCUDACXX_PP_PROBE_EMPTY \
_LIBCUDACXX_PP_PROBE(~)
#define _LIBCUDACXX_PP_PROBE_EMPTY()
#define _LIBCUDACXX_PP_IS_NOT_EMPTY(...) \
_LIBCUDACXX_PP_EVAL( \
_LIBCUDACXX_PP_CHECK, \
_LIBCUDACXX_PP_CAT(_LIBCUDACXX_PP_PROBE_EMPTY_PROBE_, \
_LIBCUDACXX_PP_PROBE_EMPTY __VA_ARGS__())) \
/**/
#define _LIBCUDACXX_PP_TAIL(_, ...) __VA_ARGS__
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_M0(_REQ) \
_LIBCUDACXX_CONCEPT_FRAGMENT_REQS_SELECT_(_REQ)(_REQ)
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_M1(_REQ) _LIBCUDACXX_PP_EXPAND _REQ
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_(...) \
{ _LIBCUDACXX_PP_FOR_EACH(_LIBCUDACXX_CONCEPT_FRAGMENT_REQS_M, __VA_ARGS__) }
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_SELECT_(_REQ) \
_LIBCUDACXX_PP_CAT3( \
_LIBCUDACXX_CONCEPT_FRAGMENT_REQS_SELECT_, \
_LIBCUDACXX_PP_EVAL( \
_LIBCUDACXX_PP_CHECK, \
_LIBCUDACXX_PP_CAT3(_LIBCUDACXX_CONCEPT_FRAGMENT_REQS_SELECT_PROBE_, \
_REQ))) \
/**/
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_SELECT_PROBE_requires \
_LIBCUDACXX_PP_PROBE_N(~, 1)
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_SELECT_PROBE_noexcept \
_LIBCUDACXX_PP_PROBE_N(~, 2)
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_SELECT_PROBE_typename \
_LIBCUDACXX_PP_PROBE_N(~, 3)
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_SELECT_0 _LIBCUDACXX_PP_EXPAND
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_SELECT_1 \
_LIBCUDACXX_CONCEPT_FRAGMENT_REQS_REQUIRES_OR_NOEXCEPT
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_SELECT_2 \
_LIBCUDACXX_CONCEPT_FRAGMENT_REQS_REQUIRES_OR_NOEXCEPT
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_SELECT_3 \
_LIBCUDACXX_CONCEPT_FRAGMENT_REQS_REQUIRES_OR_NOEXCEPT
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_REQUIRES_OR_NOEXCEPT(_REQ) \
_LIBCUDACXX_PP_CAT4(_LIBCUDACXX_CONCEPT_FRAGMENT_REQS_REQUIRES_, _REQ)
#define _LIBCUDACXX_PP_EAT_TYPENAME_PROBE_typename _LIBCUDACXX_PP_PROBE(~)
#define _LIBCUDACXX_PP_EAT_TYPENAME_SELECT_(_Xp, ...) \
_LIBCUDACXX_PP_CAT3( \
_LIBCUDACXX_PP_EAT_TYPENAME_SELECT_, \
_LIBCUDACXX_PP_EVAL( \
_LIBCUDACXX_PP_CHECK, \
_LIBCUDACXX_PP_CAT3(_LIBCUDACXX_PP_EAT_TYPENAME_PROBE_, _Xp)))
#define _LIBCUDACXX_PP_EAT_TYPENAME_(...) \
_LIBCUDACXX_PP_EVAL2(_LIBCUDACXX_PP_EAT_TYPENAME_SELECT_, __VA_ARGS__, ) \
(__VA_ARGS__)
#define _LIBCUDACXX_PP_EAT_TYPENAME_SELECT_0(...) __VA_ARGS__
#define _LIBCUDACXX_PP_EAT_TYPENAME_SELECT_1(...) \
_LIBCUDACXX_PP_CAT3(_LIBCUDACXX_PP_EAT_TYPENAME_, __VA_ARGS__)
#define _LIBCUDACXX_PP_EAT_TYPENAME_typename
#if (defined(__cpp_concepts) && _LIBCUDACXX_STD_VER >= 20) || \
defined(_LIBCUDACXX_DOXYGEN_INVOKED)
#define _LIBCUDACXX_CONCEPT concept
#define _LIBCUDACXX_CONCEPT_FRAGMENT(_NAME, ...) \
concept _NAME = \
_LIBCUDACXX_PP_CAT(_LIBCUDACXX_CONCEPT_FRAGMENT_REQS_, __VA_ARGS__)
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_requires(...) \
requires(__VA_ARGS__) _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_M(_REQ) \
_LIBCUDACXX_PP_CAT2(_LIBCUDACXX_CONCEPT_FRAGMENT_REQS_M, \
_LIBCUDACXX_PP_IS_PAREN(_REQ)) \
(_REQ);
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_REQUIRES_requires(...) \
requires __VA_ARGS__
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_REQUIRES_typename(...) \
typename _LIBCUDACXX_PP_EAT_TYPENAME_(__VA_ARGS__)
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_REQUIRES_noexcept(...) \
{ __VA_ARGS__ } \
noexcept
#define _LIBCUDACXX_FRAGMENT(_NAME, ...) _NAME<__VA_ARGS__>
#else
#define _LIBCUDACXX_CONCEPT _LIBCUDACXX_INLINE_VAR constexpr bool
#define _LIBCUDACXX_CONCEPT_FRAGMENT(_NAME, ...) \
_LIBCUDACXX_INLINE_VISIBILITY auto _NAME##_LIBCUDACXX_CONCEPT_FRAGMENT_impl_ \
_LIBCUDACXX_CONCEPT_FRAGMENT_REQS_##__VA_ARGS__ > {} \
template <typename... _As> \
_LIBCUDACXX_INLINE_VISIBILITY char _NAME##_LIBCUDACXX_CONCEPT_FRAGMENT_( \
_Concept::_Tag<_As...> *, \
decltype(&_NAME##_LIBCUDACXX_CONCEPT_FRAGMENT_impl_<_As...>)); \
_LIBCUDACXX_INLINE_VISIBILITY char( \
&_NAME##_LIBCUDACXX_CONCEPT_FRAGMENT_(...))[2] /**/
#if defined(_MSC_VER) && !defined(__clang__)
#define _LIBCUDACXX_CONCEPT_FRAGMENT_TRUE(...) \
_Concept::_Is_true<decltype(_LIBCUDACXX_PP_FOR_EACH( \
_LIBCUDACXX_CONCEPT_FRAGMENT_REQS_M, __VA_ARGS__) void())>()
#else
#define _LIBCUDACXX_CONCEPT_FRAGMENT_TRUE(...) \
!(decltype(_LIBCUDACXX_PP_FOR_EACH(_LIBCUDACXX_CONCEPT_FRAGMENT_REQS_M, \
__VA_ARGS__) void(), \
false){})
#endif
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_requires(...) \
(__VA_ARGS__)->_Concept::_Enable_if_t < _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_2_
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_2_(...) \
_LIBCUDACXX_CONCEPT_FRAGMENT_TRUE(__VA_ARGS__)
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_M(_REQ) \
_LIBCUDACXX_PP_CAT2(_LIBCUDACXX_CONCEPT_FRAGMENT_REQS_M, \
_LIBCUDACXX_PP_IS_PAREN(_REQ)) \
(_REQ),
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_REQUIRES_requires(...) \
_Concept::_Requires<__VA_ARGS__>
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_REQUIRES_typename(...) \
static_cast<_Concept::_Tag<__VA_ARGS__> *>(nullptr)
#if defined(_LIBCUDACXX_COMPILER_GCC)
// GCC can't mangle noexcept expressions, so just check that the
// expression is well-formed.
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70790
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_REQUIRES_noexcept(...) __VA_ARGS__
#else
#define _LIBCUDACXX_CONCEPT_FRAGMENT_REQS_REQUIRES_noexcept(...) \
_Concept::_Requires<noexcept(__VA_ARGS__)>
#endif
#define _LIBCUDACXX_FRAGMENT(_NAME, ...) \
(1u == sizeof(_NAME##_LIBCUDACXX_CONCEPT_FRAGMENT_( \
static_cast<_Concept::_Tag<__VA_ARGS__> *>(nullptr), nullptr)))
#endif
////////////////////////////////////////////////////////////////////////////////
// _LIBCUDACXX_TEMPLATE
// Usage:
// _LIBCUDACXX_TEMPLATE(typename A, typename _Bp)
// _LIBCUDACXX_REQUIRES( Concept1<A> _LIBCUDACXX_AND Concept2<_Bp>)
// void foo(A a, _Bp b)
// {}
#if (defined(__cpp_concepts) && _LIBCUDACXX_STD_VER >= 20)
#define _LIBCUDACXX_TEMPLATE(...) template <__VA_ARGS__>
#define _LIBCUDACXX_REQUIRES(...) requires __VA_ARGS__
#define _LIBCUDACXX_AND &&
#define _LIBCUDACXX_TRAILING_REQUIRES(...) -> __VA_ARGS__ requires _LIBCUDACXX_PP_EXPAND
#else
#define _LIBCUDACXX_TEMPLATE(...) template <__VA_ARGS__
#define _LIBCUDACXX_REQUIRES(...) \
, bool _LIBCUDACXX_true_ = true, \
_Concept::_Enable_if_t <__VA_ARGS__ && \
_LIBCUDACXX_true_, \
int > = 0 > /**/
#define _LIBCUDACXX_AND \
&& _LIBCUDACXX_true_, int > = 0, _Concept::_Enable_if_t <
#define _LIBCUDACXX_TRAILING_REQUIRES_AUX_(...) \
, __VA_ARGS__>
#define _LIBCUDACXX_TRAILING_REQUIRES(...) \
-> _Concept::_Requires_t<__VA_ARGS__ _LIBCUDACXX_TRAILING_REQUIRES_AUX_
#endif
namespace _Concept {
template <bool> struct _Select {};
template <> struct _Select<true> { template <class _Tp> using type = _Tp; };
template <bool _Bp, class _Tp = void>
using _Enable_if_t = typename _Select<_Bp>::template type<_Tp>;
template <class _Tp, bool _Bp>
using _Requires_t = typename _Select<_Bp>::template type<_Tp>;
template <typename...> struct _Tag;
template <class>
_LIBCUDACXX_INLINE_VISIBILITY inline constexpr bool _Is_true() {
return true;
}
#if defined(_LIBCUDACXX_COMPILER_CLANG) || defined(_LIBCUDACXX_COMPILER_MSVC)
template <bool _Bp>
_LIBCUDACXX_INLINE_VISIBILITY _Concept::_Enable_if_t<_Bp> _Requires() {}
#else
template <bool _Bp, _Concept::_Enable_if_t<_Bp, int> = 0>
_LIBCUDACXX_INLINE_VAR constexpr int _Requires = 0;
#endif
} // namespace _Concept
#endif // _LIBCUDACXX_STD_VER > 11
#endif //_CUDA___CONCEPTS
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